package com.xxxx.server.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/***
 * 验证码
 * @author  Ding Yi
 */

@RestController
public class CaptchaController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @ApiOperation(value = "生成验证码")
    @GetMapping(value = "/captcha", produces = "image/jpeg")
    private void captcha(HttpServletRequest request, HttpServletResponse response){

        // 定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");
        //-------------------生成验证码 begin --------------------------

        /*获取验证码文本内容*/
        String text = defaultKaptcha.createText();
        System.out.println("验证码内容" + text);
        /*将验证码文本内容放入session*/
        request.getSession().setAttribute("captcha", text);
        /*根据文本内容创建图形验证码*/   
        BufferedImage image = defaultKaptcha.createImage(text);
        ServletOutputStream outputStream = null;
        try {
            outputStream = response.getOutputStream();
            /*输出流输出图片*/
            ImageIO.write(image, "jpg", outputStream);
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
          if (null != outputStream) {
              try {
                  outputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
        }


        //-------------------生成验证码 end --------------------------

    }

}
